edit: if 2 2GB 285's then you will have 2GB effective vram. SLI is not limited to any memory capacity.

edit 2: xion, ur totally right my man. I was under the impression that the gtx295 was a 1*2GB framebuffer card, but that's not true. yeah in this case, I would def stick with 2*285 2GB cards. future games will most certainly eat more thant 900MB ram. gta 4 can grab 1.5GB today.